Slide bolt and locking mechanism



Nov. 8, 1955 N. o. HOLMSTEN suns BOLT AND LOCKING MECHANISM Filed Feb.27, 1953 JTTORNEY United States Patent 2,722,819 SLIDE BOLT AND LOCKINGMECHANISM 7 Neil 0. Holmsten, New Rochelle, N. Y. Application February27, 1953, Serial No. 339,363 1 Claim. (Cl. 70-129) This inventionrelates generally to fastening means for doors, windows and the like ofthe type in which a movable bolt carried by one member is adapted toengage a keeper carried by another member. More specifically, theinvention relates to fastening means of this type in which locking meansis provided to prevent the unauthorized operation of the movable member.

An object of the invention is to provide a fastening means of this typewith locking means which is so constructed and arranged that thefastening means cannot be released even after the glass in a door,window, or the like, has been broken to afford access to the fasteningmeans.

Another object of the invention is to provide a novel and improvedfastening means of the above type.

Another object is to provide a construction wherein the lock does notmaterially increase the overall size of the slide bolt housing.

Another object is to provide a construction which is mechanically strongso that the lock cannot be forced.

Other and more specific objects of the invention will be apparent fromthe following specification and the accompanying drawings forming a partthereof wherein:

Fig. 1 is a front elevation of a locking mechanism constructed accordingto my invention applied to a door and showing the various parts thereofin locking position;

Fig. 2 is a. horizontal section taken on the line 2-2 of Fig. 1 but on alarger scale.

Fig. 3 is a perspective view of the bolt and locking mechanism with thebase plate removed to show the internal construction, showing the boltadvanced and locked;

Fig. 4 is a transverse section taken on the line 4-4 of Fig. 3;

Fig. 5 is an elevation of the bolt and locking mechanism with the baseplate removed, showing the bolt unlocked and retracted; and

Fig. 6 is a detail view of the locking slide.

Referring to the drawing more in detail, a slide bolt 1 is slidable in ahousing 2 having attaching flanges 3 which are secured to a door or thelike 4 by means shown as screws 5. A keeper 6 is attached to thestationary frame 7 by screws 8 to receive the bolt 1 when extended. Thebolt 1 is actuated by a handle 10 extending through a slot 11 in thehousing 2.

The housing is closed by a base plate 12 which may be permanentlysecured thereto if desired. The attaching screws 5 and 8 may be of thenon-removable type or may with an enlarged rearward chamber 14containing a rotary cylinder key actuated lock including a cylinder 15secured in the housing 2 and a rotary barrel 16 adapted to be locked tothe cylinder 15 or released therefrom for rotary movement by means of akey 17.

The bolt 1 is formed with an oflset tongue 20 which slides in a channel14a in the housing 2 between the lock cylinder 15 and the wall 21 of thehousing. A slide 22 slides over the end of the lock cylinder 15 in achannel formed in the housing 2 by a bottom wall 27, a front guide wall23 and a back guide wall 24. The slide 22 when 2,722,819 Patented Nov.8, 1955 retracted as in Fig. 5 provides clearance for the tongue 20 andwhen advanced as in Fig. 3 fills the space between the rear end of thetongue 20 and the back guide wall 24, thereby preventing retraction ofthe bolt 1 from the keeper 6. The slide 22 is actuated by an eccentricpin 25 on the end of the lock barrel 16 which enters an elongated slot26 in the slide 22.

In operation, when the slide 22 is retracted by rotation of the barrel16 the bolt 1 is free to be advanced or retracted. When the bolt 1 isadvanced as in Fig. 3 and the slide 22 is advanced by rotation of thebarrel 16 and the key 17 removed the bolt cannot be retracted. Since theend of the tongue 20 bears against the slide 22 which is backed up bythe back guide wall 24 which constitutes a part of the housing 2 thebolt cannot be forced open without using sufficient force to break theentire housing or to pull the attaching screws from the door.

The device is made compact by positioning the cylinder locksubstantially in line with the bolt and providing the offset tonguewhich passes between the cylinder and the housing wall.

It is to be understood that a specific embodiment has been shown forpurposes of illustration and that the invention is not restrictedthereto, but may be supplied to various uses as will be apparent to aperson skilled in the art.

I claim:

In a latching mechanism for securing a movable member against movementwith respect to a stationary member, the combination of a housingsecured to one of said members, a latching bolt slidably mounted in saidhousing, said housing having side walls extending along opposite sidesof said bolt to confine and support said bolt for a substantial portionof its length, means for retracting and advancing said latching bolt,said housing having a rear wall and having additional side walls offsetoutwardly with respect to said first side walls and with said rear wallforming a lock chamber, the rear portion of said latching bolt beingoffset to conform to the offset of one of said additional side walls andto form a tongue which extends rearwardly along said one of saidadditional side walls, said housing having a slot adjacent said lastmentioned side wall to receive said tongue, a locking mechanism forpreventing retraction of said latching bolt, said locking mechanismcomprising a cylinder lock mounted in said housing and projecting intosaid lock chamber in line with said latching bolt and having a rotarybarrel to be locked or released, said offset tongue sliding in said slotbetween said last mentioned side wall and said cylinder lock, a lockingslide sliding transversely of said housing against said rear wall andover the inner end of said cylinder lock, said locking slide beingadapted when advanced to engage the rearward end of said tongue toprevent retraction of said latching bolt from latching position and whenretracted to provide clearance for the passage of said tongue, and meansconnecting said lock barrel to advance and retract said slide when saidbarrel is released for rotation.

References Cited in the file of this patent UNITED STATES PATENTS304,203 Joerden Aug. 26, 1884 313,328 Harris Mar. 3, 1885 606,550 HolmesJune 28, 1898 660,061 Macnamara Oct. 16, 1900 1,086,692 Venning Feb. 10,1914 1,243,618 Mackay Oct. 16, 1917 1,251,987 McFarland Jan. 1, 19181,554,839 Brown Sept. 22, 1925 2,083,878 Swanson June 15, 1937 2,468,406Mora Apr. 26, 1949

